Suggest Remedy For Pain In Breasts And Heavy Periods

hi i am 18, and last week my boobs been hurting all week. is it just my hormones kicking in that is making it grow. i thought i was pregnant for a while but in then i had my period yesterday, and this period is heavy and it hurts like no other. do you think i might of ben pregnant. or is it change due to having sex. i dont know i am confusead and making me just to conclusion like what happen if i was pregnant and i had a miscarriage. is taht possible.